April Weather in Casper, United States

Last updated: June 24, 2025

The average temperature in Casper, United States during April hovers around 3°C (38°F). Expect temperatures to range from a minimum of -23°C (-8°F) to a pleasant maximum of 22°C (73°F). This month, you'll likely encounter 59 mm (2.3 in) of precipitation spread across 13 days, while the average humidity rests at a comfortable 67%.

April Temperature in Casper

In April in Casper, the average temperature is 3°C (38°F). Maximum temperatures can reach 22°C (73°F), while minimums can drop as low as -23°C (-8°F). Be prepared for a wide range of temperatures when traveling to Casper this month!

April Weather in Casper: Daily Temperature Highs, Lows, and Averages

The chart illustrates April temperature patterns in Casper, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Casper, April typically has an average temperature of 3°C (38°F), with highs reaching up to 22°C (73°F) and lows dropping to around -23°C (-8°F).

Data source: Temperature data for Casper generated using information from the Copernicus Climate Change Service.

April Precipitation in Casper

In Casper in April, the precipitation amount is 59 mm (2.3 in) spread over 13 days.

April Precipitation Trends in Casper

The chart displays monthly precipitation patterns in Casper, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Casper, April typically receives around 59 mm (2.3 inches) of precipitation spread over approximately 13 days.

Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

April Humidity in Casper

In Casper in April, humidity is 67%. With an average temperature of 3°C (38°F), this humidity feels like an unexpected chill in the air, making it essential for travelers to dress in layers and be prepared for damp conditions that can intensify the cold.

April Average Humidity in Casper

This chart illustrates the average monthly humidity levels in Casper, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Casper is approximately 67%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Casper

In Casper in April, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Casper.

Maximum UV Index Levels in Casper for April

The chart shows the monthly maximum UV Index (UVI) for Casper in April, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In April, the maximum UV index in Casper typically reaches 11, which falls under the extreme exposure category.

Data source: Casper April UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How April Weather in Casper Compares to Other Months

Weather in Casper varies notably across the year, with each month offering distinct climate conditions. This page compares April’s weather to other months in Casper, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Casper, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	23 mm (0.9 inches)	79%	moderate
February Weather	-7°C (19°F)	31 mm (1.2 inches)	81%	high
March Weather	-1°C (31°F)	48 mm (1.9 inches)	70%	high
April Weather	3°C (38°F)	59 mm (2.3 inches)	67%	extreme
May Weather	10°C (50°F)	70 mm (2.7 inches)	70%	very high
June Weather	18°C (65°F)	30 mm (1.2 inches)	75%	extreme
July Weather	22°C (72°F)	17 mm (0.7 inches)	76%	extreme
August Weather	21°C (69°F)	19 mm (0.7 inches)	76%	extreme
September Weather	16°C (60°F)	29 mm (1.2 inches)	72%	very high
October Weather	5°C (41°F)	43 mm (1.7 inches)	70%	high
November Weather	1°C (34°F)	26 mm (1.0 inches)	76%	moderate
December Weather	-5°C (24°F)	27 mm (1.1 inches)	81%	moderate